3X Miller-Colburn Bone File 3X Miller-Colburn Bone File BF3X The 3X Miller-Colburn cross-cut bone file is used for final smoothing and shaping of bone with 6.2mm and 4.8mm working ends. Where to Buy x Category - Any - Dealer Partners Sales Representative Strategic Markets Schools Representative Accutronâ„¢ Equipment Sales Zip Code Find Representative Reset No results found. Please try a different search or explore: Sales Representatives | Dealer Partners | Strategic Markets | Schools | Accutron